Value Collection ZMSCH90345 Nitrile O-ring Dash 345 25 Pack

Product Description

The VALUE COLLECTION ZMSCH90345 is a Dash 345 Buna-N (Nitrile Butadiene Rubber) O-ring rated for continuous service from -40 to 250 degrees F. It measures 4 inches inside diameter, 4.375 inches outside diameter, and 0.1875 inches (3/16 inches) cross-section thickness. The compound carries a 90 durometer hardness rating, placing it in the extra-hard category for applications that demand firm sealing under compression. This O-ring is sold in a package of 25 units and is suited for installation by licensed plumbers, HVAC technicians, and fluid-system technicians working with petroleum-based media. It conforms to SAE and MIL-Spec standards.

This O-ring is designed for use in systems that contact petroleum products, including hydraulic circuits, fuel handling assemblies, refrigeration service ports, and general fluid-sealing applications across residential and commercial environments. The Buna-N compound offers reliable performance in static and dynamic sealing configurations where exposure to petroleum-based oils, fuels, and greases is expected. The extended temperature range makes it suitable for both outdoor and mechanical-room installations where ambient and operating temperatures vary significantly.

Key Features

• Buna-N (Nitrile Butadiene Rubber) compound with excellent resistance to petroleum products
• 90 durometer extra-hard rating for high-compression sealing applications
• Operating temperature range: -40 to 250 degrees F
• Round cross-section, 0.1875 inches thick, Dash 345 standard sizing
• Meets SAE and MIL-Spec standards
• Package quantity of 25 units; minimum order quantity of 1

Compatibility

Compatible with systems and components that contact petroleum products, including hydraulic fluid, fuel, and petroleum-based oils. Not recommended for exposure to ozone, direct sunlight, or proximity to motors and other electrical equipment that may generate ozone. Not FDA approved.

Installation Notes

Installation is typically performed by licensed plumbers, HVAC technicians, or fluid-system mechanics. Always depressurize and isolate the fluid circuit before replacing O-rings. Inspect the groove and mating surfaces for nicks, corrosion, or debris prior to seating the new O-ring. Avoid twisting the O-ring during installation and use a compatible lubricant approved for Buna-N compounds and the media present in the system.